Woodpecker's automatic campaign pause kicks in when bounces hit 5%. BounceZero removes the addresses that would trigger that pause - before your sequence ever starts.
100 free verifications every month - No credit card required
Woodpecker protects your sender reputation by halting campaigns when bounce rates climb. Good for deliverability - bad for momentum. Here's what triggers it.
Woodpecker automatically pauses a campaign once bounces approach 5%. On a 1,000-prospect list, that's just 50 bad addresses - an amount almost any unverified B2B list contains.
B2B contacts change jobs constantly. Roughly 22% of email addresses go stale every year, so even a list that was clean six months ago is quietly accumulating future bounces.
Around 23% of B2B domains are catch-all servers that accept everything during a basic check - then bounce later mid-sequence. These are the bounces that blindside Woodpecker users.
Every email in your prospect list runs through the full BounceZero pipeline - up to 99.8% accuracy in internal testing on SMTP-verifiable addresses against an industry benchmark of ~95%.
We connect to the recipient's mail server and confirm the exact mailbox exists - the bounces Woodpecker counts against your 5% limit start here.
Our 3-probe method resolves catch-all domains that single-check tools mark "unknown" - critical for the 23% of B2B domains that accept everything.
Flags info@, sales@ and admin@ addresses that rarely reply to cold outreach and frequently report spam, dragging down your Woodpecker stats.
Catches temporary and throwaway addresses that slipped into your list from lead forms or scraped data sources.
Confirms the domain can actually receive mail. Dead domains are the fastest route to a hard bounce and a paused sequence.
Identifies likely spam traps that never bounce but silently destroy the sender reputation of your Woodpecker sending domains.
Five minutes of verification protects weeks of sequenced outreach. Here's the workflow.
Export prospects as CSV from Woodpecker, or take the raw list straight from your data source (Apollo, LinkedIn scrape, purchased list) before it ever touches your campaign.
Drag the CSV into the BounceZero dashboard. Up to 1,000,000 addresses per dashboard job - a typical 10K prospect list finishes in 5-10 minutes.
Mailbox existence, 3-probe catch-all resolution, role, disposable, MX and spam trap detection run against every address at up to 99.8% accuracy in internal testing on SMTP-verifiable addresses.
Get your results split into Valid, Risky and Invalid. Keep the valid addresses, drop the invalid, and make a judgement call on risky catch-alls.
Upload the cleaned CSV as prospects in Woodpecker and launch your campaign knowing the 5% bounce pause is out of reach - cleaned lists bounce under 0.5%.
Prefer to verify programmatically as prospects enter your pipeline?
Explore the real-time API (provider-dependent response time)A paused Woodpecker sequence costs you days of pipeline. Verification costs $3 per 1,000 emails.
Common questions from Woodpecker users about verifying cold email lists.
Yes - via CSV. Export your prospects from Woodpecker (or verify your raw list before importing), upload it to BounceZero, and re-import the cleaned CSV. A 10K list takes 5-10 minutes. If you feed prospects into Woodpecker programmatically, you can also verify each address in real time through our API with a provider-dependent response time.
Woodpecker pauses campaigns when bounce rates approach roughly 5% to protect your sending domain. On a 1,000-prospect list that's only about 50 bad addresses. Lists cleaned with BounceZero typically bounce under 0.5%, keeping you an order of magnitude below the threshold.
Around 23% of B2B domains are catch-all, meaning basic verifiers can't tell if a specific mailbox exists. BounceZero uses a 3-probe catch-all detection method that resolves most of these to a confident verdict instead of dumping them into an "unknown" bucket, so you know which prospects are safe to sequence.
Woodpecker's built-in checks catch obvious syntax and domain errors, but they don't perform deep mailbox-level SMTP verification, 3-probe catch-all resolution, or spam trap detection. BounceZero verifies at up to 99.8% accuracy in internal testing on SMTP-verifiable addresses versus the ~95% industry benchmark - that gap is exactly the difference between staying under the pause threshold and hitting it.
B2B email addresses decay at roughly 22% per year as people change jobs. If a prospect list has been sitting in Woodpecker (or your CRM) for more than 3 months, re-verify it before launching a new campaign. At $3 per 1,000 emails, re-verification is far cheaper than a damaged sender domain.
$3 per 1,000 verifications, with 100 free verifications every month and no credit card required to start. Dashboard jobs support up to 1,000,000 addresses, and a typical 10K prospect list is fully processed in 5-10 minutes.
Verify your prospect list in minutes, drop your bounce rate under 0.5%, and let your sequences run without interruption. 100 free verifications a month - no credit card required.
Start Verifying Freeup to 99.8% accuracy in internal testing on SMTP-verifiable addresses - $3 per 1,000 verifications - Results in seconds
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